A lot of webminar and meetings are conducted using WebEx platform. I have attended a few of them myself. Mostly from my PC. For those using Android tablet, you can use the free Cisco WebEx apps on the Google Play to view them on Android tablet.
For those needing a guide to use the app, you can check out the PDF from WFU (Wake Forest University). Download the PDF direct here. Or click on How to Participate in a WebEx Meeting for Android Tablet.
If you are still looking for Android tablet, you can read my article on Mini Tablet PC to help you decide.